ES2778204T3 - Signal synchronization method and device for high frequency communication - Google Patents

Abstract

A small cell, in which the small cell comprises: a first communications module (801), configured to carry out (201), in a first pair of beams, a high frequency data communication with the user equipment; a first sending module (802), configured to: when the user equipment is determined to enter a dead zone state, send (202) a synchronization indication signal to the user equipment, wherein the indication signal The synchronization includes at least fast synchronization indication information and user equipment information, and the user equipment information comprises the user ID information, the beam ID information of a pair of beams and the cell ID information; a second sending module (803), configured to send (203), on a specific high frequency resource, a synchronization signal to the user equipment; and a second communications module (804), configured to: when the synchronization confirmation information is received from the user equipment, carry out (204), in a second pair of beams, the communication of high frequency data with the user equipment according to the information of the second beam pair in the synchronization confirmation information, wherein the second beam pair is a beam pair that has the highest received reference signal power and is obtained by the user equipment carrying out the measurement in a current synchronization process.

Description

DESCRIPTION

Signal synchronization method and device for high frequency communication

Technical field

The present invention relates to the field of wireless communication technologies and, in particular, to a signal synchronization method and apparatus for high-frequency communication.

With the development of wireless communication technologies, there are more scenarios where communication takes place using high frequency spectrum resources, such as spectrum resources above 6 GHz (gigahertz). In a scenario where a high-frequency communications base station conducts outdoor high-frequency communications with user equipment, synchronization between the high-frequency communications base station and user equipment must be performed before that high-frequency communication is implemented.

Document US 2014/321375 A1 describes methods and devices to obtain a high frequency carrier in a wireless communication network.

WO 2013/086164 A1 describes methods and apparatus for millimeter wave communication systems.

WO 2014/172306 A2 describes the implementation of a method to control discontinuous reception.

In the prior art, during the implementation of high-frequency communication signal timing, a beamforming technology is used, so that the high-frequency communication base station can periodically send a timing signal in beams with different phases. The user equipment searches and compares all the beams, to obtain a beam pair with the highest received reference signal power, and receives the synchronization signal in the beam pair. Therefore, the signal synchronization is implemented between the high-frequency communication base station and the user equipment, and subsequently, the user equipment can communicate with the high-frequency communication base station using the beam pair.

In a process of implementing the present invention, the inventor finds that the related technology has at least the following problems:

Due to an attenuation characteristic of a high frequency signal, a case of misalignment of the beams, signal interference or the like may occur. As a result, a signal received by the user equipment is extremely weak, and normal communication cannot be implemented, that is, a communication dead zone appears. In the prior art, after implementing the signal synchronization between the HF communication base station and the user equipment, in a subsequent communication process, if the communication dead zone appears, the received reference signal power of the pair of beams obtained previously may be weakened. Consequently, HF communication cannot be implemented continuously using the pair of beams. Communication can only be switched to low-frequency communication, but the communication service quality of low-frequency communication is relatively poor.

Compendium

To solve a problem existing in the prior art, embodiments of the present invention provide a signal synchronization method and apparatus for high frequency communication as defined in the independent claims. Additional embodiments are provided by the dependent claims. Embodiments of the description that are not within the scope of protection of the claims are provided for explanatory purposes only. The technical solutions are as follows:

According to a first aspect, a signal synchronization method is provided for a high-frequency communication carried out with a small cell, in which the method includes:

carrying out, in a first pair of beams, a high frequency data communication with the user equipment;

if the user equipment is determined to enter a dead zone state, sending a sync indication signal to the user equipment, wherein the sync indication signal includes at least fast sync indication information and information user equipment, and the user equipment information includes the user ID information, the beam ID information of a pair of beams and the cell ID information, sending, on a specific resource of high frequency, a synchronization signal to the user equipment; and

if synchronization confirmation information is received from the user equipment, carry out, in a second pair of beams, high-frequency data communication with the user equipment in accordance with the information of the second pair of beams in the information of synchronization confirmation, wherein the second beam pair is a beam pair having the highest received reference signal power and which is obtained by the user equipment carrying out a measurement in a current synchronization process.

Referring to the first aspect, in a first possible way of implementing the first aspect, before sending a synchronization indication signal to the user equipment, the method further includes:

receiving a measurement information reported by the user equipment, wherein the measurement information includes a received reference signal power and a travel speed of the user equipment; and when the received reference signal power is less than a preset threshold, or the traveling speed of the user equipment is greater than a preset speed, or no high-frequency data signal sent by the user equipment is received within of a preset period of time, determine that the user equipment enters the dead zone state.

Referring to the first aspect, in a second possible implementation way of the first aspect, before sending a synchronization signal to the user equipment, the method further includes:

receiving multiple beam pairs recorded by the user equipment in an initial synchronization process and the received reference signal powers of all beam pairs; and

select, from the multiple pairs of beams and, according to the received reference signal powers of the multiple pairs of beams, a pair of beams with a received reference signal power that is greater than the preset threshold, and add the beam ID information of the beam pair to the sync indication signal.

Referring to the first aspect, in a third possible implementation way of the first aspect, after sending, on a specific high-frequency resource, a synchronization signal to the user equipment, the method further includes:

if the synchronization confirmation information from the user equipment is not received, deactivate the high frequency data communication and report the current state of the user equipment communication to a macro base station.

Referring to the first aspect, in a fourth possible implementation of the first aspect, the method further includes: sending user equipment information to the macro base station, so that the macro base station sends the synchronization indication signal to the user equipment and to the small cell.

Correspondingly, after sending, on a specific high-frequency resource, a sync signal, the method further includes:

if the synchronization confirmation information from the user equipment sent by the macro base station is not received, deactivate the high-frequency communication data and ignore notifications of the current state of the communication from the user equipment to the macro base station.

According to a second aspect, a signal synchronization method is provided for a high frequency communication carried out by a user equipment, wherein the method includes:

carrying out, in a first pair of beams, a high frequency data communication with a small cell; if it was determined that the user equipment enters a dead zone state, receiving a synchronization indication signal, wherein the synchronization indication signal includes at least one fast synchronization indication information and synchronization equipment information. user, and the user equipment information includes the user ID information, the beam ID information of a pair of beams, and the cell ID information; receiving, on a specific high frequency resource, a synchronization signal sent by the small cell; and carry out the synchronization with the small cell according to the synchronization signal, and send, to the small cell, synchronization confirmation information containing the information of the second pair of beams, where a second pair of beams is a pair beam having the highest received reference signal power and which is obtained by the user equipment carrying out the measurement in a current synchronization process.

Referring to the second aspect, in a first possible implementation way of the second aspect, after carrying out, in a first pair of beams, the communication of high-frequency data with a small cell, the method further includes:

measurement, by the user equipment, of a received reference signal power and a travel speed, and sending the measurement information to the small cell in an interval of a preset period of time; and

when the received reference signal power is less than a preset threshold, or the traveling speed of the user equipment is greater than a preset speed, or no high frequency data signal sent by the small cell is received within a preset period of time, determine that the user equipment enters the dead zone state.

Referring to the second aspect, in a second form of possible implementation of the second aspect, the method further includes:

receiving the sync indication signal sent by a macro base station.

Correspondingly, the sending, to the small cell, of the synchronization confirmation information containing the information of the second pair of beams includes:

send the synchronization confirmation information to the macro base station, so that the macro base station sends the synchronization confirmation information containing the information of the second pair of beams to the small cell.

Referring to the second aspect, in a third possible implementation way of the second aspect, after receiving, on a specific high-frequency resource, a synchronization signal sent by the small cell, the method further includes:

If synchronization with the small cell cannot be implemented, disable the high-frequency data communication and carry out the low-frequency data communication with the macro base station.

According to a third aspect, a signal synchronization method is provided for a high frequency communication carried out by a macro base station, where the method includes:

receiving, after the user equipment enters a dead zone state, the user equipment information notified by a small cell, where the user equipment information includes the user ID information, the user ID information beam of a pair of beams and the cell ID information;

sending a synchronization indication signal to the user equipment and the small cell according to the user equipment information, where the synchronization indication signal includes less fast synchronization indication information and user equipment information, and the information User equipment includes the user ID information, the beam ID information of a pair of beams and the cell ID information; and

if the synchronization confirmation information from the user equipment is received, send, to the small cell, the synchronization confirmation information containing the information of the second pair of beams, for the small cell to carry out, in a second pair beam, a high-frequency data communication with the user equipment, where the second pair of beams is a beam pair having the highest received reference signal power and which the user equipment obtains by carrying out the measurement at a current synchronization process.

Referring to the third aspect, in a first possible way of implementing the third aspect, after sending a synchronization indication signal to the user equipment and the small cell according to the user equipment information, the method further includes:

If the synchronization confirmation information from the user equipment is not received, controlling the small cell to deactivate the high-frequency data communication and to carry out the low-frequency data communication with the user equipment.

According to a fourth aspect, a small cell is further provided, where the small cell includes:

a first communication module, configured to carry out, in a first pair of beams, a high frequency data communication with the user equipment;

a first sending module, configured to: when it is determined that the user equipment enters a dead zone state, sending a synchronization indication signal to the user equipment, where the synchronization indication signal includes at least one fast synchronization indication information and a user equipment information, and the user equipment information includes the user ID information, the beam ID information of a pair of beams, and the ID information of the cell;

a second sending module, configured to send, on a specific high frequency resource, a synchronization signal to the user equipment; and

a second communication module, configured to: when the synchronization confirmation information is received from the user equipment, carry out, in a second pair of beams, high-frequency data communication with the user equipment, in accordance with the information of the second pair of beams in the synchronization confirmation information, where the second pair of beams is a pair of beams having the highest received reference signal power and which the user equipment obtains by carrying out the measurement in a current sync process.

Referring to the fourth aspect, in a first possible implementation of the fourth aspect, the small cell further includes:

a first receiving module, configured to receive measurement information reported by the user equipment, wherein the measurement information includes a received reference signal power and a travel speed of the user equipment; and

a determination module, configured for: when the received reference signal power is less than a preset threshold, or the travel speed of the user equipment is greater than a preset speed, or a high frequency data signal is not received sent by the user equipment within a preset period of time, determining that the user equipment enters the dead zone state.

Referring to the fourth aspect, in a second possible implementation of the fourth aspect, the small cell further includes:

a second receiving module, configured to receive multiple pairs of beams registered by the user equipment in an initial synchronization process and the received reference signal powers of all pairs of beams; and

an addition module, configured to: select, from the multiple pairs of beams, and according to the received reference signal powers of the multiple pairs of beams, a pair of beams with a received reference signal power that is greater than the preset threshold, and add the beam ID information of the beam pair to the timing indication signal.

Referring to the fourth aspect, in a third possible implementation form of the fourth aspect, the small cell further includes:

a first deactivation module, configured to: when user equipment synchronization confirmation information is not received, deactivating high-frequency data communication; and

a notification module, configured to notify a current state of user equipment communication to a macro base station.

Referring to the fourth aspect, in a fourth possible implementation way of the fourth aspect, the first sending module is further configured to send the user equipment information to the macro base station, so that the macro base station sends the signal synchronization indication to the user equipment and the small cell.

Correspondingly, the small cell further includes:

a second deactivation module, configured to: when the synchronization confirmation information is not received from the user equipment sent by the macro base station, deactivate the high-frequency data communication and ignore the notification of the current state of the equipment communication user to the macro base station.

According to a fifth aspect, a user equipment is further provided, where the user equipment includes:

a communication module, configured to carry out, in a first pair of beams, a communication of high frequency data with a small cell;

a first receiving module, configured to: when the user equipment is determined to enter a dead zone state, receive a synchronization indication signal, wherein the synchronization indication signal includes at least synchronization indication information Quick and the user equipment information, and the user equipment information includes the user ID information, the beam ID information of a pair of beams, and the cell ID information;

a second reception module, configured to receive, on a specific high frequency resource, a synchronization signal sent by the small cell; and

a first sending module, configured to: perform synchronization with the small cell according to the synchronization signal, and send, to the small cell, synchronization confirmation information containing the information of the second pair of beams, where A second pair of beams is a pair of beams that has the highest received reference signal power and that is obtained by the user equipment carrying out the measurement in a current synchronization process.

Referring to the fifth aspect, in a first possible implementation way of the fifth aspect, the user equipment further includes:

a second sending module, configured to send measurement information measured by the user equipment to the small cell in an interval of the preset period of time, where the measurement information includes a received reference signal power and a travel speed of; and

a determination module, configured for: when the received reference signal power is less than a preset threshold, or the travel speed of the user equipment is greater than a preset speed, or a high frequency data signal is not received sent by the small cell within a preset period of time, determining that the user equipment enters the dead zone state.

Referring to the fifth aspect, in a second possible implementation of the fifth aspect, the first receiving module is further configured to receive the synchronization indication signal sent by a macro base station.

Correspondingly, the first sending module is further configured to send the synchronization confirmation information to the macro base station, so that the macro base station sends, to the small cell, the synchronization confirmation information containing the information of the second pair of beams.

Referring to the fifth aspect, in a third way of possible implementation of the fifth aspect, the user equipment further includes:

a deactivation module, configured to: when synchronization with the small cell cannot be implemented, deactivate high-frequency data communication and carry out low-frequency data communication with the macro base station.

According to a sixth aspect, a macro base station is further provided, where the macro base station includes:

a receiving module, configured to receive, after the user equipment enters a dead zone state, the user equipment information reported by a small cell, where the user equipment information includes the user equipment ID information user, the beam ID information of a pair of beams and the cell ID information;

a first sending module, configured to send a synchronization indication signal to the user equipment and the small cell according to the user equipment information, wherein the synchronization indication signal includes at least synchronization indication information Quick and the user equipment information, and the user equipment information includes the user ID information, the beam ID information of a pair of beams, and the cell ID information; and

a second sending module, configured to: when the synchronization confirmation information is received from the user equipment, to send, to the small cell, the synchronization confirmation information containing the information of the second pair of beams, so that the cell small conduct, on a second pair of beams, a high frequency data communication with the user equipment, where the second pair of beams is a pair of beams having the highest received reference signal power and obtaining the user equipment carrying out a response measurement in a current synchronization process.

Referring to the sixth aspect, in a first possible implementation form of the sixth aspect, the macro base station further includes:

a control module, configured to: when the synchronization confirmation information is not received from the user equipment, control the small cell to disable high-frequency data communication and carry out low-frequency data communication with the monitoring equipment user.

The beneficial effects of the technical solutions provided in the embodiments of the present invention are as follows:

After the user equipment enters a dead zone state, a small cell sends a synchronization indication signal to the user equipment, to carry out, in a second pair of beams, a high-frequency data communication with the user equipment after re-carrying out, on a specific high-frequency resource, a synchronization with the user equipment, thereby implementing high-frequency data communication quickly carrying out the resynchronization in the zone state dead. Therefore, the communication service quality is relatively high.

Brief description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present invention, the following briefly describes the accompanying drawings required to describe the embodiments.

Figure 1 is a diagram of the state transition of user equipment in a high frequency communication scenario, in accordance with one embodiment of the present invention;

Figure 2 is a flow chart of a signal synchronization method for high-frequency communication, according to one embodiment of the present invention;

Figure 3 is a flow chart of a signal synchronization method for high frequency communication, in accordance with an embodiment of the present invention;

Figure 4 is a flow chart of a signal synchronization method for high-frequency communication, in accordance with an embodiment of the present invention;

Figure 5A and Figure 5B are a flow chart of a signal synchronization method for high frequency communication, in accordance with one embodiment of the present invention;

Figure 6 is a schematic diagram of a specific high frequency resource, in accordance with one embodiment of the present invention;

FIG. 7A and FIG. 7B are a flow chart of a signal synchronization method for high-frequency communication, in accordance with one embodiment of the present invention;

Figure 8 is a schematic structural diagram of a small cell in accordance with one embodiment of the present invention;

Figure 9 is a schematic structural diagram of a small cell in accordance with one embodiment of the present invention;

Figure 10 is a schematic, structural diagram of a small cell in accordance with one embodiment of the present invention;

Figure 11 is a schematic, structural diagram of a small cell in accordance with one embodiment of the present invention;

Figure 12 is a schematic, structural diagram of a small cell in accordance with one embodiment of the present invention;

Figure 13 is a schematic, structural diagram of user equipment in accordance with one embodiment of the present invention;

Figure 14 is a schematic, structural diagram of user equipment in accordance with one embodiment of the present invention;

Figure 15 is a schematic, structural diagram of user equipment in accordance with one embodiment of the present invention;

Figure 16 is a schematic, structural diagram of a macro base station, in accordance with one embodiment of the present invention; and

Figure 17 is a schematic, structural diagram of a macro base station, in accordance with one embodiment of the present invention.

Description of achievements

In order to clarify the objectives, technical solutions and advantages of the present invention, the following describes in more detail the embodiments of the present invention with reference to the accompanying drawings.

For ease of explanation and description, first, an implementation scenario of embodiments of the present invention is briefly described. In a hybrid network scenario, there is a base station used for low-frequency communication and a base station used for high-frequency communication, and the two base stations also communicate. To differentiate the two different base stations, the low frequency base station and the high frequency base station are hereinafter collectively referred to as a macro base station and a small cell. In a coverage area of the macro base station, several small cells may be arranged, according to a requirement. Small cell coverage areas are evenly divided into several cells. Between the small cell and the user equipment to which the small cell belongs, the data information is transmitted at a high frequency, and the control information is transmitted using a low frequency. Similarly, the control information is mainly transmitted between the macro base station and the small cell and is therefore transmitted at a low frequency. Figure 1 is a state transition diagram of user equipment in a high frequency communication scenario, in accordance with one embodiment of the present invention. Referring to Fig. 1, in this embodiment of the present invention, the states of the user equipment can be classified into four types, that is, a normal state of communication (Normal), a blocked state of communication (Blocked) , a deviated state of communication (Deviated) and an interfered-with state (Interfered).

Specifically, the normal state of communication indicates that normal high-frequency communication can be carried out between user equipment and a small cell. The communication blocked state indicates that a signal is blocked due to the existence of an obstacle, and the high frequency communication cannot be fully carried out between the user equipment and a small cell. The deviated state of communication indicates that a communication link deteriorates due to misalignment of the beams when carrying out high frequency communication between user equipment and a small cell using a pair of beams, which affects high frequency communication. The jammed state indicates that a signal is extremely weak, and even cannot be received, because the user equipment is affected by backward interference when receiving a signal from a small cell, affecting high-frequency communication. As shown in Figure 1, the four states can be changed randomly. Three states, different from the normal state of communication, out of the four states mentioned above, belong to a dead zone state.

Figure 2 is a flow chart of a signal synchronization method for high frequency communication, in accordance with an embodiment of the present invention. Referring to Figure 2, for example, from a small cell perspective, a process of the method provided in this embodiment includes:

201. Carry out, in a first pair of beams, a high-frequency data communication with the user equipment.

In a high frequency communication scenario, the data communication between the small cell and the user equipment is implemented using a high frequency. To effectively compensate for a free path loss in an outdoor high frequency communication scenario, a beamforming technology is used, so that the small cell can communicate with the user equipment by using a pair beams with strong directivity. Specifically, the beams transmitted by the small cell and the beams transmitted by the end of the user equipment can form one-to-one beam pairs. In this embodiment of the present invention, for the user equipment, the first beam pair is a beam pair with the highest received reference signal power. The user equipment communicates with the small cell using the first pair of beams, so that a good quality of service of the communication can be guaranteed.

202. If it is determined that the user equipment enters a dead zone state, sending a synchronization indication signal to the user equipment, wherein the synchronization indication signal includes at least fast synchronization indication information and information of user equipment, and the user equipment information includes the user ID information, the beam ID information of a pair of beams and the cell ID information.

Specifically, the fast sync indication information in the sync indication signal is used to indicate the performance of a fast sync based on the signal, that is, the fast resynchronization carried out after the user equipment enters in the dead zone state, so that by detecting the signal, the user equipment can discover that the user equipment is currently in a synchronization process and thus receives a synchronization signal on a specific resource of high frequency according to the timing indication signal. The specific high-frequency resource is a pre-specified time and frequency resource block that is used especially for user computer synchronization.

The user equipment information includes user ID information, beam ID information of a pair of beams, and cell identification information. The user ID information is the user equipment ID obtained by numbering all the user equipment by the small cell. Furthermore, in this embodiment of the present invention, in all the directions that the small cell can send a beam, a beam is numbered according to a natural order, in order to obtain a small cell beam ID. Similarly, a beam ID of the user equipment is obtained at the end of the user equipment, to record, during the initial synchronization between the user equipment and the small cell, the information of the beam ID of a pair of beams with a received reference signal power that exceeds a preset threshold. Therefore, the information of the beam ID of a pair of beams includes the beam ID of the small cell and the beam ID of the user equipment. The cell ID information is the ID information of cells divided in a small cell coverage area. Because the specified high-frequency resources allocated for each cell are different, the identification information of the cell can make the user equipment and the small cell discover a specific high-frequency resource in which synchronization must be carried out. carried out later, thereby improving the efficiency of the synchronization process. Furthermore, the cell ID and the user ID can also cause the target user equipment to confirm that the synchronization indication signal is sent to the user equipment. Indeed, in this embodiment of the present invention, the synchronization indication signal can also be sent to the user equipment and the small cell by a macro base station, so that fast synchronization between the user equipment and the small cell is they can perform on a specific high frequency resource.

In this embodiment of the present invention, the user equipment enters the dead zone state, that is, due to an obstacle, signal interference or the like, the received reference signal power from the first pair of beams previously encountered by the user equipment is weakened and thus high frequency communication between small cell and user equipment cannot be carried out continuously using the first pair of beams. Specifically, for the small cell, according to the measurement information reported by the user equipment, if the received reference signal power is less than a preset threshold, or a traveling speed is greater than a preset speed, or no high-frequency data signal sent by the user equipment is received within a preset period of time, it can be determined that the user equipment enters the dead zone state. Therefore, a subsequent signal synchronization method is carried out, and the signal synchronization with the user equipment is performed again, to restore communication. A person skilled in the art can set a value for the preset period of time in advance. This is not specifically limited in this embodiment of the present invention.

203. Send, on a specific high frequency resource, a synchronization signal to the user equipment.

204. If synchronization confirmation information is received from the user equipment, carry out, in a second pair of beams, high-frequency data communication with the user equipment, according to the information of the second pair of beams in the synchronization confirmation information, where the second beam pair is a beam pair having the highest received reference signal power and which the user equipment obtains by carrying out measurements in a current synchronization process.

Specifically, the synchronization confirmation information is used to notify the small cell or macro base station that the synchronization is successful. The synchronization confirmation information contains the information of the second pair of beams. The second pair of beams is a pair of beams that have the highest received reference signal power and this is obtained by carrying out measurements in the synchronization process. The synchronization confirmation information can be sent directly to the small cell by the user equipment, or it can be sent to the small cell by the macro base station after being sent to the macro base station by the user equipment. This is not specifically limited in this embodiment of the present invention.

Optionally, before sending a sync indication signal to the user equipment, the method further includes:

receiving measurement information reported by the user equipment, wherein the measurement information includes a received reference signal power and a travel speed of the user equipment; and

when the received reference signal power is less than a preset threshold, or the traveling speed of the user equipment is greater than a preset speed, or no high-frequency data signal sent by the user equipment is received within a preset period of time, determine that the user equipment enters the dead zone state.

Optionally, before sending a sync signal to the user equipment, the method further includes:

receiving multiple beam pairs recorded by the user equipment in an initial synchronization process and the received reference signal powers of all beam pairs; and

select, from the multiple pairs of beams and, according to the received reference signal powers of the multiple pairs of beams, a pair of beams with a received reference signal power that is greater than the preset threshold, and add information from the beam ID of the beam pair to the sync indication signal.

Optionally, after sending, on a specific high-frequency resource, a synchronization signal to the user equipment, the method further includes:

if the synchronization confirmation information is not received from the user equipment, disable the high-frequency data communication and notifications of a current communication state from the user equipment to a macro base station.

Optionally, the method further includes: sending user equipment information to the macro base station, so that the macro base station sends the synchronization indication signal to the user equipment and the small cell.

Correspondingly, after sending, on a specific high-frequency resource, a sync signal, the method further includes:

if the synchronization confirmation information from the user equipment sent by the macro base station is not received, disable the high-frequency data communication and ignore the notification of the current state of the user equipment communication to the macro base station.

According to the method provided in this embodiment, after the user equipment enters a dead zone state, a small cell sends a synchronization indication signal to the user equipment, to carry out, in a second pair of you do, a high-frequency data communication with the user equipment after re-carrying out, on a specific high-frequency resource, the synchronization with the user equipment, thereby implementing the high-frequency data communication carrying quickly out a new synchronization in dead zone state. Therefore, the communication service quality is relatively high.

Figure 3 is a flow chart of a signal synchronization method for high-frequency communication, in accordance with an embodiment of the present invention. Referring to Figure 3, for example, from the perspective of the user equipment, a process of the method provided in this embodiment includes:

301. Carrying out, on a first pair of beams, high-frequency data communication with a small cell.

302. If it is determined that the user equipment enters a dead zone state, receiving a synchronization indication signal, wherein the synchronization indication signal includes at least fast synchronization indication information and user equipment information. , and the user equipment information includes the user ID information, the beam ID information of a pair of beams, and the cell ID information.

303. Receive, on a specific high-frequency resource, a synchronization signal sent by the small cell.

304. Carry out synchronization with the small cell according to the synchronization signal, and send, to the small cell, the synchronization confirmation information containing the information of the second pair of beams, where a second pair of beams is a pair of beams having the highest received reference signal power and which is obtained by user equipment carrying out measurements in a current synchronization process.

Optionally, after carrying out, on a first pair of beams, high-frequency data communication with a small cell, the method further includes:

measuring, by the user equipment, a received reference signal power and a travel speed, and sending the measurement information to the small cell in an interval of a preset period of time; and

when the received reference signal power is less than a preset threshold, or the traveling speed of the user equipment is greater than a preset speed, or no high frequency data signal sent by the small cell is received within a preset period of time, determine that the user equipment enters the dead zone state.

Optionally, the method additionally includes:

receiving the sync indication signal sent by a macro base station.

Correspondingly, the sending, to the small cell, of the synchronization confirmation information containing the information of the second pair of beams includes:

send the synchronization confirmation information to the macro base station, so that the macro base station sends the synchronization confirmation information containing the information of the second pair of beams to the small cell.

Optionally, after receiving, on a specific high-frequency resource, a synchronization signal sent by the small cell, the method further includes:

If synchronization with the small cell cannot be implemented, disable the high-frequency data communication and carry out the low-frequency data communication with the macro base station.

According to the method provided in this embodiment, after entering a dead zone state, the user equipment receives a synchronization indication signal, receives a synchronization signal on a specific high-frequency resource, and performs a resynchronization. with a small cell using the synchronization signal, to carry out, in a second pair of beams, high-frequency data communication with the small cell, thereby implementing high-frequency data communication quickly carrying out the resynchronization in the dead zone state. Therefore, the communication service quality is relatively high.

Figure 4 is a flow chart of a signal synchronization method for high-frequency communication, in accordance with one embodiment of the present invention. Referring to Figure 4, for example, from the perspective of a macro base station, a process of the method provided in this embodiment includes:

401. Receive the user equipment information notified by a small cell, where the user equipment information includes the user ID information, the beam ID information of a pair of beams, and the beam ID information. the cell.

402. Send a synchronization indication signal to the user equipment and the small cell, according to the user equipment information, when the synchronization indication signal includes at least the fast synchronization indication information and the information user equipment, and user equipment information It includes the user ID information, the beam ID information of a pair of beams, and the cell ID information.

403. If synchronization confirmation information is received from the user equipment, send, to the small cell, the synchronization confirmation information containing the information of the second pair of beams, for the small cell to carry out, in one second beam pair, a high frequency data communication with the user equipment, where the second beam pair is a beam pair that has the highest received reference signal power and which the user equipment obtains by carrying out the measurement in a current synchronization process.

Optionally, after sending a synchronization indication signal to the user equipment and the small cell, according to the user equipment information, the method further includes:

if the synchronization confirmation information is not received from the user equipment, controlling the small cell to deactivate the high-frequency data communication and to carry out the low-frequency data communication with the user equipment.

According to the method provided in this embodiment, after the user equipment enters a dead zone state, a macro base station receives the user equipment information sent by a small cell, in order to send a signal from synchronization indication to the user equipment and the small cell, to notify the user equipment and the small cell of a specific high-frequency resource, so that the user equipment performs a resynchronization with the small cell using the specific high-frequency resource frequency, and the small cell can carry out, in a second pair of beams, high-frequency data communication with the user equipment, thereby implementing high-frequency data communication by rapidly carrying out resynchronization in the dead zone status. Therefore, the communication service quality is relatively high.

FIG. 5A and FIG. 5B are a flow chart of a signal synchronization method for high frequency communication, in accordance with one embodiment of the present invention. A process of the method provided in this embodiment includes:

501. A small cell carries out, in a first pair of beams, a high frequency data communication with the user equipment.

Before carrying out high frequency data communication, the small cell broadcasts system information in multiple beams in different directions in one cell of the small cell. After the user equipment obtains a pair of beams with the highest received reference signal power, searching and comparing, according to the information received from the system, beams within a cell in which the user equipment is located, and uses the beam pair as the first beam pair, the small cell can carry out, in the first beam pair, high-frequency data communication with the user equipment.

502. When a received reference signal power is less than a preset threshold, or a travel speed of the user equipment is greater than a preset speed, or no high-frequency data signal sent by the user equipment is received within a preset period of time, determine that the user equipment enters a dead zone state.

Specifically, in a process of carrying out high-frequency data communication with the small cell, the user equipment can measure a current received reference signal power and a scrolling speed in an interval of the preset time period. , to obtain a measurement result and send the measurement result to the small cell. When it is determined, according to the received measurement result, that the received reference signal power is less than the preset threshold, or the traveling speed of the user equipment is greater than the preset speed, the small cell can determine that the user equipment enters the dead zone state and thus sends a synchronization indication signal to the user equipment. Certainly, when a high-frequency data signal sent by the user equipment is not received within the preset period of time, it can also be determined that the user equipment enters the dead zone state. Correspondingly, the user equipment can determine, according to the measurement result, that the user equipment currently enters the dead zone state, and therefore prepare to carry out a fast resynchronization process.

503. If it is determined that the user equipment enters the dead zone state, the small cell sends a synchronization indication signal to the user equipment, where the synchronization indication signal includes at least the synchronization indication information. fast synchronization and the user equipment information, and the user equipment information includes the user ID information, the beam ID information of a pair of beams, and the cell ID information.

To improve synchronization efficiency and implement fast synchronization, the user equipment no longer searches and compares beams in all directions. On the contrary, the small cell sends the information of the beam ID of multiple pairs of beams to the user equipment, and performs synchronization on specific high frequency resources of the multiple pairs of beams. Specifically, the beam ID information of the multiple pairs beam is included in the sync indication signal. The process of sending the synchronization indication signal is a process of sending a control signal and is therefore implemented on a low-frequency resource. In addition, the small cell sends, according to the cell ID information, the synchronization indication signal to the user equipment of a cell corresponding to the cell ID information.

Specifically, before the small cell sends the synchronization indication signal to the user equipment, the method includes: receiving multiple pairs of beams registered by the user equipment in an initial synchronization process and the reference signal powers received from all beam pairs; and adding, according to the received reference signal powers of the multiple beam pairs, the beam ID information of a beam pair with a received reference signal power that exceeds the preset threshold for the indication signal sync. During the specific implementation, in the initial synchronization process, that is, a search process for the first pair of beams, one or more pairs of beams can be registered with the received reference signal powers that exceed the preset threshold value, or multiple pairs of beams can be recorded according to a preset amount, to perform a subsequent process of adding the beam ID information of the beam pairs to the timing indication signal. After the user equipment is determined to enter the dead zone state, the small cell sends the synchronization indication signal containing the beam ID information of a pair of beams to the user equipment to the user equipment to perform synchronization on a specific high-frequency resource according to the information of the beam ID of a pair of beams.

504. If the user equipment determines that the user equipment enters the dead zone state, receive the synchronization indication signal.

Specifically, the user equipment receives, on the low-frequency resource, the synchronization indication signal sent by the small cell. Furthermore, the user equipment can discover, according to the cell ID information and the user ID information found in the synchronization indication signal, that the synchronization indication signal is sent for the user equipment, and quickly find a corresponding time and frequency resource according to the cell identification information.

In this embodiment of the present invention, after receiving a synchronization indication signal, the user equipment confirms, according to the cell ID information and the user ID information found in the synchronization signal. sync indication, that the sync indication signal is sent to the user equipment; and obtains, according to the information of the cell ID in the synchronization indication signal, a specific high frequency resource corresponding to a cell; and obtains, from the synchronization indication signal, the information of the beam ID of one or more pairs of beams, to receive a synchronization signal on a specific high-frequency resource of the pairs of beams.

505. The small cell sends, on a specific high-frequency resource, a synchronization signal to the user equipment.

The specific high-frequency resource is a pre-specified time and frequency resource block that is used especially for user computer synchronization. Referring to Figure 6, Figure 6 is a schematic diagram of a specific high frequency resource, in accordance with one embodiment of the present invention. The shaded parts are the specific high frequency resource. When the sync signal is sent using a time division mode, as shown in Figure 6 (a), a lateral axis represents the time domain, and the specific high-frequency resource occupies a part of the resources of the time domain in each time period. When the sync signal is sent using a frequency division mode, as shown in Figure 6 (b), a longitudinal axis represents the frequency domain, and the specific high-frequency resource takes on a frequency band specific. Indeed, in actual application, the sync signal can also be sent using a space division mode. In this case, the specific high frequency resource is a time and frequency resource in a specific pair of beams. This is not specifically limited in this embodiment of the present invention.

506. The user equipment receives, on the specific high-frequency resource, the synchronization signal sent by the small cell, performs synchronization with the small cell according to the synchronization signal, and sends, to the small cell, the synchronization confirmation information containing the information of the second pair of beams, where a second pair of beams is a pair of beams having the highest received reference signal power and which is obtained by the user equipment carrying out the measurement in a current synchronization process.

In this embodiment of the present invention, because the high frequency data communication between the small cell and the user equipment is carried out using the first pair of beams indicated above, after the user equipment enters the dead zone status, high-frequency data communication cannot be carried out continuously. In this case, a second pair of beams with the highest current received reference signal power needs to be quickly found to carry out communication.

Specifically, the process of performing synchronization with the small cell according to the signal from Synchronization includes: searching and comparing, in the specific high-frequency resource, beam pairs corresponding to the beam ID information of a beam pair, to obtain a beam pair with the highest received reference signal power and using the bundle pair as the second bundle pair; and adding the information of the second pair of beams to the synchronization confirmation information. A preset threshold value can be established in advance by a person skilled in the art. This is not specifically limited in this embodiment of the present invention.

507. If the small cell receives the synchronization confirmation information sent by the user equipment, carry out, in the second pair of beams, the high-frequency data communication with the user equipment, according to the second information of the beam pair in the synchronization confirmation information, where the second beam pair is the beam pair that has the highest received reference signal power and is obtained by the user equipment performing measurements in the current process of synchronization.

In this embodiment of the present invention, the synchronization confirmation information of the user equipment includes the information of the second pair of synchronized beams. If the small cell receives the synchronization confirmation information from the user equipment, the small cell may discover that the user equipment finds, in the specific high-frequency resource, the second pair of beams with the highest received reference signal power current. Therefore, the small cell can determine, according to the synchronization confirmation information, that the synchronization between the user equipment and the small cell has been completed, obtain the information of the second beam pair in the confirmation information of synchronizing and re-carrying out high frequency data communication with the user equipment using the second pair of beams.

508. If the small cell does not receive the synchronization confirmation information from the user equipment, turn off the high-frequency data communication and report a current state of the user equipment communication to a macro base station.

After the small cell sends, in the low-frequency resource, the synchronization indication signal to the user equipment, if the synchronization confirmation information is not received from the user equipment, it can be considered that the synchronization between the user equipment user and small cell is unsuccessful, that is, a beam pair with a received reference signal power that meets a communication need cannot be found in the beam pairs provided by the sync indication signal, or a link is still relatively poor and cannot meet a normal communication requirement. Therefore, the small cell disables the high-frequency data communication, and reports the current communication status of the user equipment to the macro base station, so that the macro base station can carry out low data communication. frequently with the user equipment.

According to the method provided in this embodiment, after the user equipment enters a dead zone state, a small cell again performs, on a specific high-frequency resource, synchronization with the user equipment, to carry out, in a second pair of beams, a high-frequency data communication with the user equipment, thereby implementing high-frequency data communication by rapidly carrying out resynchronization in the dead zone state. Therefore, the communication service quality is relatively high. Unlike a time-consuming search method in which, during initial synchronization, all base stations are traversed and user equipment needs to compare all pairs of beams, in this embodiment of the present invention, one channel of Dedicated resources are reserved for a specific user, in order to implement fast synchronization, reduce the probability of communication interruption, and ensure communication quality.

In the above embodiment, the transmission of the control information is carried out by a small cell. However, in another embodiment, the transmission of the control information may be carried out by a macro base station, and only the high-frequency data transmission is carried out between the small cell and the user equipment. Correspondingly, referring to Figure 7A and Figure 7B, Figure 7A and Figure 7B are a flow chart of a signal synchronization method for high frequency communication, in accordance with one embodiment of the present invention. . A process of the method provided in this embodiment includes:

701. A small cell carries out, in a first pair of beams, a high frequency data communication with the user equipment.

In this embodiment of the present invention, the process of step 701 is similar to the process of step 501. Details are not described herein.

702. When a received reference signal power is less than a preset threshold, or a travel speed of the user equipment is greater than a preset speed, or a high-frequency data signal sent by the user equipment is not received within a preset period of time, determine that the user equipment enters a dead zone state.

In this embodiment of the present invention, the process of step 702 is similar to the process of step 502. Details are not described herein.

703. If it is determined that the user equipment enters the dead zone state, the small cell sends the user equipment information to a macro base station. After receiving the user equipment information, the macro base station sends a synchronization indication signal to the user equipment and the small cell. The synchronization indication signal includes at least the fast synchronization indication information and the user equipment information, and the user equipment information includes the user ID information, the beam ID information. a pair of beams and the cell ID information.

After the user equipment is determined to enter the dead zone state, the small cell sends the user equipment information to the macro base station, that is, the user ID information, the ID information. beam of a pair of beams and the cell ID information, so that the macro base station can add the user equipment information to the sync indication signal. The macro base station sends the synchronization indication signal to the user equipment and to the small cell, so that the small cell executes an operation of sending a synchronization signal on a specific high-frequency resource and therefore synchronization between the user equipment and the small cell is carried out on the specific high-frequency resource.

704. If the user equipment determines that the user equipment enters the dead zone state, receive the synchronization indication signal.

In this embodiment of the present invention, the process of step 704 is similar to the process of step 504. Details are not described herein.

705. The small cell sends, on a specific high-frequency resource, a synchronization signal; the user equipment receives the synchronization signal at the specific high-frequency resource, performs synchronization with the small cell according to the synchronization signal, and sends the synchronization confirmation information to the macro base station that contains the information of the second pair of beams, where the second pair of beams is a pair of beams that has the highest received reference signal power and that is obtained by the user equipment carrying out the measurement in a current process of synchronization.

Specifically, the process of performing small cell synchronization in accordance with the synchronization signal may be similar to the process of step 506. Details are not described herein. After sending the synchronization confirmation information to the small cell, the user equipment carries out high-frequency data communication with the small cell using the second pair of beams.

706. If the macro base station receives the synchronization confirmation information sent by the user equipment, it forwards, to the small cell, the synchronization confirmation information containing the information of the second pair of beams.

After receiving the synchronization confirmation information sent by the user equipment, the macro base station also needs to send the synchronization confirmation information to the small cell, so that the small cell can carry out the communication of high frequency data with user equipment.

707. The small cell carries out, in the second pair of beams, high-frequency data communication with the user equipment, according to the information of the second pair of beams in the synchronization confirmation information, where the second beam pair is the beam pair which has the highest received reference signal power and which is obtained by the user equipment carrying out measurements in the current synchronization process.

708. If the macro base station does not receive the synchronization confirmation information from the user equipment, control the small cell to disable high-frequency data communication.

If the macro base station does not receive the synchronization confirmation information sent by the user equipment, the macro base station controls the small cell to disable high-frequency data communication. The control process can be: send a result about a failed synchronization to the small cell, so that the small cell deactivates the high frequency data communication after receiving the result. In this case, because the macro base station receives the synchronization confirmation information sent by the user equipment, the small cell may not notify the current state of the communication of the user equipment to the macro base station, and the macro base station conducts low-frequency data communication with user equipment.

In this embodiment of the present invention, if the received reference signal powers of one or more pairs of beams that are obtained in a corresponding specific high-frequency resource, and according to the information of the beam ID of the one or more more pairs of beams and in the synchronization signal are all below the preset threshold, it can be considered that the user equipment cannot carry out the synchronization with the small cell. Therefore, the high-frequency data communication is disabled, and the low-frequency data communication is carried out with the macro base station.

According to the method provided in this embodiment, after the user equipment enters a state of dead zone, a macro base station activates a fast synchronization between the user equipment and a small cell, so that the small cell again carries out, on a specific high-frequency resource, the synchronization with the user equipment, to carry out, in a second pair of beams, a high-frequency data communication with the user equipment, thereby implementing a high-frequency data communication by carrying out fast resynchronization in the dead zone state. Therefore, the communication service quality is relatively high. Unlike a time-consuming search method in which, during initial synchronization, all base stations are traversed and user equipment needs to periodically compare all pairs of beams, in this embodiment of the present invention, a channel Dedicated resource pool is reserved for a specific user, to implement fast synchronization, reduce the likelihood of communication outage, and ensure communication quality.

Figure 8 is a schematic, structural diagram of a small cell in accordance with one embodiment of the present invention. The small cell is configured to execute a function executed by a small cell involved in any embodiment in all of the above embodiments. Referring to Figure 8, the small cell includes:

a first communication module 801, configured to carry out, in a first beam, a high frequency data communication with the user equipment;

a first forwarding module 802, configured to: when the user equipment is determined to enter a dead zone state, sending a synchronization indication signal to the user equipment, where the synchronization indication signal includes at least the fast sync indication information and the user equipment information, and the user equipment information includes the user ID information, the beam ID information of a pair of beams, and the user equipment ID information. the cell;

a second sending module 803, configured to send, on a specific high frequency resource, a synchronization signal to the user equipment; and

a second communication module 804, configured to: when the synchronization confirmation information is received from the user equipment, carry out, in a second pair of beams, high-frequency data communication with the user equipment in accordance with the information of the second pair of beams in the synchronization confirmation information, where the second pair of beams is a pair of beams having the highest received reference signal power and which is obtained by the user equipment carrying out measurements in a current synchronization process.

Optionally, referring to Figure 9, based on the schematic structural diagram shown in Figure 8, the small cell further includes:

a first receiving module 805, configured to receive the measurement information reported by the user equipment, wherein the measurement information includes a received reference signal power and a travel speed of the user equipment; and

a determination module 806, configured for: when the received reference signal power is less than a preset threshold or the travel speed of the user equipment is greater than a preset speed, or a high frequency data signal is not received sent by the user equipment within a preset period of time, determining that the user equipment enters the dead zone state.

Optionally, referring to Figure 10, based on the schematic structural diagram shown in Figure 8 or Figure 9, the small cell further includes:

a second receiving module 807, configured to receive multiple pairs of beams registered by the user equipment in an initial synchronization process and the received reference signal powers of all pairs of beams; and

an addition module 808, configured to: select, from the multiple pairs of beams and according to the received reference signal powers of the multiple pairs of beams, a pair of beams with a received reference signal power that is higher than the preset threshold and add the beam ID information of the beam pair to the sync indication signal.

Optionally, referring to Figure 11, based on the schematic, structural diagram shown in Figure 8, Figure 9, or Figure 10, the small cell further includes:

a first deactivation module 809, configured to: when the synchronization confirmation information is not received from the user equipment, deactivating high frequency data communication;

a notification module 810, configured to notify the current state of user equipment communication to a macro base station.

Optionally, the first sending module is also configured to send the user equipment information to the macro base station, so that the macro base station sends the synchronization indication signal to the user equipment and the small cell.

Correspondingly, referring to Figure 12, based on the schematic, structural diagram shown in Figure 8, Figure 9, Figure 10, or Figure 11, the small cell further includes:

a second deactivation module 811, configured to: when the synchronization confirmation information is not received from the user equipment sent by the macro base station, deactivate the high-frequency data communication and omit the notification of the current state of the communication from the user equipment to the macro base station.

According to the small cell provided in this embodiment, after the user equipment enters a dead zone state, a small cell sends a synchronization indication signal to the user equipment, to carry out, in a second pair beams, a high-frequency data communication with the user equipment after performing again, on a specific high-frequency resource, the synchronization with the user equipment, thereby implementing the high-frequency data communication by fast synchronization in the dead zone state. Therefore, the communication service quality is relatively high.

Figure 13 is a schematic, structural diagram of user equipment in accordance with one embodiment of the present invention. The user equipment is configured to execute a function executed by the user equipment involved in any embodiment in all of the above embodiments. Referring to Figure 13, user equipment includes:

a communication module 1301, configured to carry out, in a first pair of beams, high frequency data communication with a small cell;

a first reception module 1302, configured to: when the user equipment is determined to enter a dead zone state, receive a synchronization indication signal, wherein the synchronization indication signal includes at least one indication information fast synchronization and the user equipment information, and the user equipment information includes the user ID information, the beam ID information of a pair of beams and the cell ID information;

a second reception module 1303, configured to receive, on a specific high frequency resource, a synchronization signal sent by the small cell;

a first sending module 1304, configured to: carry out a synchronization with the small cell according to the synchronization signal, and send, to the small cell, synchronization confirmation information containing the information of the second pair of beams, where a second pair of beams is a pair of beams having the highest received reference signal power and which is obtained by the user equipment carrying out the measurement in a current synchronization process.

Optionally, referring to Figure 14, based on the schematic, structural diagram shown in Figure 13, the user equipment further includes:

a second sending module 1305, configured to send the measurement information measured by the user equipment to the small cell in an interval of a preset period of time, where the measurement information includes a received reference signal power and a speed displacement;

a determination module 1306, configured for: when the received reference signal power is less than a preset threshold, or the travel speed of the user equipment is greater than a preset speed, or no high data signal is received frequency sent by the small cell within a preset period of time, determining that the user equipment enters the dead zone state.

Optionally, the first receiving module 1302 is further configured to receive the sync indication signal sent by a macro base station.

Correspondingly, the first sending module 1304 is further configured to send the synchronization confirmation information to the macro base station, so that the macro base station sends, to the small cell, the synchronization confirmation information containing the information of the second pair of beams.

Optionally, referring to Figure 15, based on the schematic, structural diagram shown in Figure 13 or Figure 14, the user equipment further includes:

a deactivation module 1307, configured to: when synchronization with the small cell cannot be implemented, deactivate the high-frequency data communication and carry out low-frequency data communication with the macro base station.

According to the user equipment provided in this embodiment, after entering a dead zone state, the user equipment receives a synchronization indication signal, receives a synchronization signal in a specific high-frequency resource and performs a resynchronization with a small cell by using the synchronization signal, to carry out, in a second pair of beams, high-frequency data communication with the small cell, implementing thus high-frequency data communication quickly carrying out resynchronization in the dead zone state. Therefore, the communication service quality is relatively high.

Figure 16 is a schematic, structural diagram of a macro base station in accordance with one embodiment of the present invention. The macro base station is configured to execute a function executed by a macro base station involved in any embodiment in all of the above embodiments. Referring to Figure 16, the macro base station includes:

a receiving module 1601, configured to receive the user equipment information notified by a small cell, where the user equipment information includes user ID information, the beam ID information of a pair of beams, and the information the cell ID;

a first sending module 1602, configured to send a synchronization indication signal to the user equipment and to the small cell, in accordance with the user equipment information, where the synchronization indication signal includes at least the synchronization information fast synchronization indication and the user equipment information, and the user equipment information includes the user ID information, the beam ID information of a pair of beams, and the cell ID information; and

a second sending module 1603, configured to: when it receives the synchronization confirmation information from the user equipment, send, to the small cell, the synchronization confirmation information containing the information of the second pair of beams, so that the cell small carry out, on a second pair of beams, a high frequency data communication with the user equipment, where the second pair of beams is a pair of beams having the highest received reference signal power and which is obtained by the user equipment carrying out the measurement in a current synchronization process.

Optionally, referring to Figure 17, based on the schematic, structural diagram shown in Figure 16, the macro base station further includes:

a 1604 control module, configured to: when the synchronization confirmation information is not received from the user equipment, control the small cell to disable high-frequency data communication and carry out low-frequency data communication with the user equipment.

According to the macro base station provided in this embodiment, after the user equipment enters a dead zone state, a macro base station receives the user equipment information sent by a small cell, to send an indication signal Synchronization to the user equipment and the small cell to notify the user equipment and the small cell of a specific high-frequency resource, so that the user equipment performs resynchronization with the small cell using the specific high-frequency resource, and the small cell can carry out, in a second pair of beams, high-frequency data communication with the user equipment, thereby implementing high-frequency data communication by carrying out fast resynchronization in the state of dead zone. Therefore, the communication service quality is relatively high.

It should be noted that, according to the signal synchronization method for high-frequency communication provided in the above embodiment, when the signal synchronization for high-frequency communication is carried out, the description is provided only using the division of the function modules listed above. In the actual application, functions can be assigned to different function modules for implementation as required. To be specific, the internal structures of an apparatus and a device are divided into different function modules to implement all or part of the functions described above. Furthermore, the signal synchronization apparatus for high-frequency communication provided in the above embodiment belongs to the same concept as the realization of the signal synchronization method for high-frequency communication. For a specific implementation process of the signal synchronization apparatus for high-frequency communication, see the embodiment of the method. Details are not described in this document.

A person of ordinary skill in the art can understand that all or some of the stages of the embodiments can be implemented by hardware or hardware related to program instructions. The program may be stored on a computer-readable storage medium. The storage medium can include: a read-only memory, a magnetic disk, or an optical disk.

Claims (22)

1. A small cell, in which the small cell comprises: a first communication module (801), configured to carry out (201), in a first pair of beams, a high frequency data communication with the user equipment; a first sending module (802), configured to: when the user equipment is determined to enter a dead zone state, send (202) a synchronization indication signal to the user equipment, wherein the indication signal The synchronization includes at least fast synchronization indication information and user equipment information, and the user equipment information comprises the user ID information, the beam ID information of a pair of beams and the cell ID information; a second sending module (803), configured to send (203), on a specific high frequency resource, a synchronization signal to the user equipment; and a second communications module (804), configured to: when the synchronization confirmation information is received from the user equipment, carry out (204), in a second pair of beams, the communication of high-frequency data with the equipment according to the information of the second pair of beams in the synchronization confirmation information, in which the second pair of beams is a pair of beams that has the highest received reference signal power and that is obtained by the equipment user performing the measurement in a current synchronization process. The small cell according to claim 1, wherein the small cell further comprises: a first receiving module, configured to receive the measurement information reported by the user equipment, wherein the measurement information comprises a received reference signal power and a travel speed of the user equipment; and a determination module, configured for: when the received reference signal power is less than a preset threshold, or the travel speed of the user equipment is greater than a preset speed, or a high frequency data signal is not received sent by the user equipment within a preset period of time, determining that the user equipment enters the dead zone state. The small cell according to claim 1 or 2, wherein the small cell further comprises: a second receiving module, configured to receive multiple pairs of beams registered by the user equipment in an initial synchronization process and the received reference signal powers of all pairs of beams; and an addition module, configured to: select, from the multiple pairs of beams and according to the received reference signal powers of the multiple pairs of beams, a pair of beams with a received reference signal power that is higher than the preset threshold, and add the beam ID information of the beam pair to the timing indication signal. The small cell according to any one of claims 1 to 3, wherein the small cell further comprises: a first deactivation module, configured to: when the synchronization confirmation information is not received from the user equipment, deactivating the high frequency data communication; and a notification module, configured to notify a current state of user equipment communication to a macro base station. The small cell according to any one of claims 1 to 4, wherein the first sending module is further configured to send the user equipment information to the macro base station, so that the macro base station send the sync indication signal to the user equipment and to the small cell, where, correspondingly, the small cell further comprises: a second deactivation module, configured to: when the synchronization confirmation information is not received from the user equipment sent by the macro base station, deactivate the high-frequency data communication and ignore the notification of the current state of the equipment communication user to the macro base station. 6. User equipment, in which the user equipment comprises: a communication module (1301), configured to carry out (301), in a first pair of beams, a high frequency data communication with a small cell; a first receiving module (1302), configured to: when the user equipment is determined to enter a dead zone state, receiving (302) a timing indication signal, wherein the timing indication signal comprises, at least, fast synchronization indication information and user equipment information, and the user equipment information comprises the user ID information, the beam ID information of a pair of beams and the ID information of the cell; a second reception module (1303), configured to receive (303), on a specific high frequency resource, a synchronization signal sent by the small cell; and a first sending module (1304), configured to: carry out (304) a synchronization with the small cell according to the synchronization signal, and send, to the small cell, the synchronization confirmation information containing the information of the second pair of beams, wherein a second pair of beams is a pair of beams that has the highest received reference signal power and that is obtained by the user equipment carrying out the measurement in an actual synchronization process. The user equipment according to claim 6, wherein the user equipment further comprises: a second sending module, configured to send the measurement information measured by the user equipment to the small cell in an interval of a preset period of time, in which the measurement information comprises a received reference signal power and a velocity of displacement; and a determination module, configured for: when the received reference signal power is less than a preset threshold value, or the travel speed of the user equipment is greater than a preset speed, or a high data signal is not received frequency sent by the small cell within a preset period of time, determining that the user equipment enters the dead zone state. The user equipment according to claim 6 or 7, wherein the first receiving module is further configured to receive the synchronization indication signal sent by a macro base station; and correspondingly, the first sending module is further configured to send the synchronization confirmation information to the macro base station, so that the macro base station sends, to the small cell, the synchronization confirmation information containing the information of the second pair of beams. The user equipment according to any one of claims 6 to 8, wherein the user equipment further comprises: a deactivation module, configured to: when synchronization with the small cell cannot be implemented, deactivate high-frequency data communication and carry out low-frequency data communication with the macro base station. 10. A macro base station, wherein the macro base station comprises: a receiving module (1601), configured to, after the user equipment enters a dead zone state, receiving the user equipment information reported by a small cell, wherein the user equipment information comprises the user ID information, beam ID information of a pair of beams, and cell ID information; a first sending module (1602), configured to send a synchronization indication signal to the user equipment and the small cell according to the user equipment information, wherein the synchronization indication signal comprises at least the fast sync indication information and the user equipment information, and the user equipment information comprises the user ID information, the beam ID information of a pair of beams, and the ID information of the cell; and a second sending module (1603), configured to: when the synchronization confirmation information is received from the user equipment, sending, to the small cell, the synchronization confirmation information containing the information of the second pair of beams, to the small cell to carry out, in a second pair of beams, a high frequency data communication with the user equipment, wherein the second pair of beams is a pair of beams having the highest reference signal power received and which is obtained by the user equipment carrying out the measurement in a current synchronization process. The macro base station according to claim 10, wherein the macro base station further comprises: a control module, configured to: when the synchronization confirmation information is not received from the user equipment, control the small cell to disable high-frequency data communication, and to carry out low-frequency data communication with the user team 12. A signal synchronization method for high-frequency communication, wherein the method is carried out by a small cell and comprises: carrying out (201), in a first pair of beams, a high frequency data communication with the user equipment; if the user equipment is determined to enter a dead zone state, sending (202) a synchronization indication signal to the user equipment, wherein the synchronization indication signal comprises at least the synchronization indication information. fast synchronization and user equipment information, and the user equipment information comprises the user ID information, the beam ID information of a pair of beams and the cell ID information; sending (203), on a specific high frequency resource, a synchronization signal to the user equipment; and if the synchronization confirmation information is received from the user equipment, carrying out (204), in a second pair of beams, the high-frequency data communication with the user equipment according to the information of the second pair of beams in the synchronization confirmation information, wherein the second beam pair is a beam pair having the highest received reference signal power and which is obtained by user equipment carrying out the measurement in a current process sync. The method according to claim 12, wherein prior to sending a sync indication signal to the user equipment, the method further comprises: receiving the measurement information reported by the user equipment, wherein the measurement information comprises a received reference signal power and a travel speed of the user equipment; and when the received reference signal power is less than a preset threshold, or the traveling speed of the user equipment is greater than a preset speed, or no high-frequency data signal sent by the user equipment is received within of a preset period of time, determine that the user equipment enters the dead zone state. The method according to claim 12 or 13, wherein prior to sending a sync signal to the user equipment, the method further comprises: receiving multiple beam pairs recorded by the user equipment in an initial synchronization process and the received reference signal powers of all beam pairs; and select, from among the multiple pairs of beams and according to the received reference signal powers from the multiple pairs of beams, a pair of beams with a received reference signal power that is greater than the preset threshold, and add the information from the beam ID of the beam pair to the sync indication signal. The method according to any one of claims 12 to 14, wherein after sending, on a specific high-frequency resource, a synchronization signal to the user equipment, the method further comprises: if the synchronization confirmation information is not received from the user equipment, deactivate the high-frequency data communication and report a current state of the user equipment communication to a macro base station. The method according to any one of claims 12 to 15, wherein the method further comprises: sending the user equipment information to the macro base station, so that the macro base station sends the indication signal of synchronization to the user equipment and the small cell, in which correspondingly, after sending, on a specific high-frequency resource, a synchronization signal, the method further comprises: if the synchronization confirmation information from the user equipment sent by the macro base station is not received, disable the high-frequency data communication and ignore the notification of the current state of the user equipment communication to the macro base station. 17. A signal synchronization method for high-frequency communication, in which the method is carried out by user equipment and comprises: carrying out (301), in a first pair of beams, a high frequency data communication with a small cell; if it is determined that the user equipment enters a dead zone state, receiving (302) a timing indication signal, wherein the timing indication signal comprises at least the fast timing indication information and user equipment information, and the user equipment information comprises the the user ID, the beam ID information of a pair of beams and the cell ID information; receiving (303), on a specific high frequency resource, a synchronization signal sent by the small cell; and performing (304) a synchronization with the small cell in accordance with the synchronization signal, and sending, to the small cell, the synchronization confirmation information containing the information of the second pair of beams, in which a second pair beam is a pair of beams that has the highest received reference signal power and that is obtained by the user equipment carrying out the measurement in a current synchronization process. The method according to claim 17, wherein after carrying out, on a first pair of beams, high-frequency data communication with a small cell, the method further comprises: measurement, by the user equipment, of a received reference signal power and a travel speed, and send the measurement information to the small cell in an interval of a preset period of time; and when the received reference signal power is less than a preset threshold, or the traveling speed of the user equipment is greater than a preset speed, or no high frequency data signal sent by the small cell is received within a preset period of time, determine that the user equipment enters the dead zone state. 19. The method according to claim 17 or 18, wherein the method further comprises: receive the synchronization indication signal sent by a macro base station, wherein, correspondingly, the sending, to the small cell, of the synchronization confirmation information containing the information of the second pair of beams comprises: send the synchronization confirmation information to the macro base station, so that the macro base station sends the synchronization confirmation information containing the information of the second pair of beams to the small cell. The method according to any one of claims 17 to 19, wherein after receiving, on a specific high-frequency resource, a synchronization signal sent by the small cell, the method further comprises: If synchronization with the small cell cannot be implemented, disable the high frequency data communication and carry out a low frequency data communication with the macro base station. 21. A signal synchronization method for high-frequency communication, wherein the method is carried out by a macro base station and comprises: receiving (401), after the user equipment enters a dead zone state, the user equipment information reported by a small cell, wherein the user equipment information comprises the user ID information, the beam ID information of a pair of beams and the cell ID information; sending (402) a synchronization indication signal to the user equipment and the small cell according to the user equipment information, wherein the synchronization indication signal comprises at least the fast synchronization indication information and the user equipment information, and the user equipment information comprises the user ID information, the beam ID information of a pair of beams, and the cell ID information; and if the synchronization confirmation information is received from the user equipment, send (403), to the small cell, the synchronization confirmation information containing the information of the second pair of beams, for the small cell to carry out, in a second pair of beams, a high-frequency data communication with the user equipment, wherein the second pair of beams is a pair of beams that has the highest received reference signal power and that is obtained by the user carrying out the measurement in a current synchronization process. The method according to claim 21, wherein after sending a sync indication signal to the user equipment and the small cell according to the user equipment information, the method further comprises: if the synchronization confirmation information is not received from the user equipment, controlling the small cell to deactivate the high-frequency data communication and carry out a low-frequency data communication with the user equipment.